Pneumatic switch.



Patented Mar. 18,1919.

w; E. HASKELL. PNEUMATIC SWITCH APPLICATION FILED JUNE 24.1918.

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UNITED PATENT v.

WILLIAM E. HASRELL, orlnaarrnnnono, vnnrion r, assrenon r0 sew-an ORGAN;

COMPANY, or ima'rtrnnnono, vnamongr,nfooaronnrron rn'nunarro swrzrcn;

Original application filed January 22, 191 7, Serial No. 143,750. Divided and this 1918. Seria1-Ro. 241,526.

To all whom it may concern:

Be it known that 1, WILLIAM E. HASKELL, of Brattleboro, in the county of Windham, in the State of Vermont, have inventeda new and Improved Pneumatic Switch, of which the following is a specification.

This application is a tion filed January 22, 1917, Serial Hunt ber 1 l3,7'50, for improvements in organs. While the pneumatic switch herein set forth is particularly designed for usein organs it may he employed in other organizations wherein it is useful to open and'close an electric circuit by a pneumatically actuated switch. Y I I Oneembodiment of the improved pneumatic switch is illustrated in the accompany- I ing drawings wherein-- Figure '1 is a cross section of a tube bar such as is employed in an organ having an electro pneumatic action, such tube bar being shown equipped with one of. the pneumatic switches in its normal open position. Fig.

2 is a vertical section of the pneumaticswi ch on a. larger scale than shown in Fig. 1, the switch being shown in osition to close the electriccircuit eontrolled thereby. Fig.

, tionary piston 3' is a cross section in the planeindicated by the line 3'-3 in Fig. 2.

The switch includes an inverted cylindi-ical metallic cup A, preferably of copper. The lower open end of the cup fits upon a sta- B, having an easy sliding fit thereupon. "-The piston B- is composed of plumbago, thereby insuring a non-corrodible organization" which permits the cup to readily slide whilemaintaining' a. sufficiently close fit to'gavoid objectionable airleakage.

-The piston B hasa reduced foot 4, which is 'socketed into thetop of a tube bar G. This tube bar has an air passage 5. .Ifair under pressure ente'rs the channel 5, it passes through a lateral port 6, into the hollow central bore 7 of the piston B and thence into the upper end of the cup A. Thereupon the cup rises. Then, when the air pressure in the passage 5, is vented, the cup A drops by gravity.

This up and down pneumatically controlled movement of the cup A is utilized to make and break an electric circuit. Soldered to one side of the cup is a fine coiled wire 8, which is connected at its other end to i '1 Specification of Letters lfatent.

I afixed metallic rod 9,

division of ap lica-v or annons v 1 i minal of an electric circui This ment of the cup so that it offers wire extends at right-angles [to gthelmovei no sensible resistance to such movementl, The cupT-jit; lts top has a central nomcorrodibl contactf button, preferably oi platinum,

-1 nediately beneath the outer a resil l lent metallic spring cont'ac't D', which 'i'slse which is imcured at its other end to a fixed bus-bar This contact D constitute's 'the opposite 'ter minal of the circuit whichincludesthe rod is in line with the bore 7.'-:.

165' 9. .The free end ofthis Normally there is no excessairpressure in the passage 5, and, consequentlyfthec'up A occupies its lower position shown in Fig.

. 1 and below and outofrcontact} with the Consequently the elecsprin terminal D.

trio-circuit is normally broken. When, new:

,a z ho n m compressed air is admittedfinto the terminal D, and hence closing he leeti-icr circuit, r,

The-extent of the rise and A may be regulated by the '1lustrated ad'- justin'g devices-.- A handv screws into the bottom bar and passes centrallythroughtheport6;?

and the bore 7. a stop .Gr, having upper part 13 of a feltplii'l d pff topi he the Central bore is "enlarged to accommodate thesto'pi The eiitentof cup A, is thus downward movementof the determined by the position of the adjustable padded stop G, since when, in its lowest p g terminal 1). movement of the cup fi'cient to m'akeQand to close the electri circuit it abuts against the cuprests thereon osition. The ppward movement ofthe cup islimitedbythejyieldQ The extent of "vertical need onlyb'e just sufbreak the electric 'cir, 1 cuit, so that a minimum"quantity of air is:

At its uppere'iidit carries the resilient terminal D, which yields under the impact of the cup thereby reducing the noise to a minimum.

Fig. 1 illustrates a tube bar C having a large number of air passages 5, and hence of the metallic switches, such as is set forth in the aforesaid parent application Serial Number 143,7 50, in connection with a tracker over which a perforated note sheet travels. Each aperture in the tracker com- ;municates by means of a tube 14:, with one of the air passages 5, in the tube bar C. Hence, when an aperture in the tracker is uncovered by a hole in the note sheet air flows into the corresponding air passage 5, and the correspondingpneumatic switch is closed. I11 order to protect the pneumatic switches from the dust and to mutfie the same so as to contribute to noiselessness they are inclosed by a cover H, resting on the top of the tube bar C. In the-event that the cup A, is lifted by compressed air admitted into the air passage 5, the cover H does not fit tight on the tube bar so that the sensitiveness of the cup is not interfered with by leakage of air between the cup and the piston.

I claim- LIA pneumatic switch mechanism having, a bus-bar E, a resilient terminal D, a fixed terminal 9, a fixed plumbago piston B, having a central bore 7, in line with the free end of said resilient terminal and a tube bar C, having an air passage 5. and a port 6, between said passage and bore, in combination with a rising and falling inverted metallic cup sliding upon. said piston with an easy fit and adapted when lifted to contact with the free yieldingend of said resilient terminal. a coiled wire 8,-connected at opposite ends to said cup and said fixed terminal respectii'ely, and an adjusting ,rod F, screwing into said tube bar extending into the piston and having on its upper end a padded stop to limit the descentof the cup.

2. A pneumatic switch mechanism having. a bus-bar, a resilient terminal, a fixed terminal, a fixed plumbago piston having a central bore and tube bar having an air passage and a port between said passage and bore. in combination with a rising and falling inverted metallic cup sliding upon said. piston with an. easy fit and adapted when lifted to contact with the free yielding end of said resilient terminal, and a coiled wire connected at. opposite ends to said cup and said fixed terminal respectively.

3. A pneumatic switch mechanism having a resilient terminal, and a fixed plumbago piston having a central bore, in combination with a metallic cup slidin upon said piston and. adapted when move -to contact with the free yielding end of said resilient terminal, and means for admitting air into said 0111) through the bore of said piston.

4. A pneumatic switch mechanism having a resilient terminal, and a fixed piston with abore; in combination with a metallic cup slidin upon said piston and adapted when move to contact with the free yielding-end of said resilient terminal, and means for admitting air into said cup through the bore of said piston.

5. A pneumatic switch mechanism having, a resilient terminal, a fixed terminal, and a piston, in combination with a metallic cup sliding upon said piston and adapted when moved to contact with the free yielding end of said resilient terminal, and a coiled wire connected at opposite ends to said cup and said fixed terminal respectively.

6. A pneumatic switch mechanism having a resilient terminal, and a fixed piston having a bore in combination with a metallic cup sliding upon said pi ton and adapted when moved to contact with the free yielding end of said resilient terminal, and an adjusting rod extending through said here and having a padded stop to limit the movement of thecup.

7. A. pneumatic switch mechanism having a fixed piston, in combination with a cup sliding upon said-piston, and an adjustable padded stop located within the cup to limit the downward movement of the cup, and means for admitting air into theinterior of the cup above the piston.

8. A pneumatic switch mechanism having a resilient terminal andv a piston, in combination with a cup sliding upon said piston and adapted when moved to contact with the free yielding end of said resilient terminal, and means for admitting air into the interior of the cup above the piston.

In witness whereof I have hereunto signed my name.

WILLIAM ASKE-LL. 

